The utility model relates to a circuit breaker, concretely relates to quick inlet wire in newly -built power station job site and circuit breaker that moves back line. It includes the circuit breakerbody, the top and the bottom of circuit breaker body all are provided with the incoming line, one side of incoming line is provided with the button, the central both sides of button all are provided with the button round hole, the outside both ends of button round hole all are provided with the inlet wire round hole, one side of inlet wire round hole is provided with the elastic component, the oneend of elastic component is fixed with the buckle base. It is wrong motionless that the mode of the wrong screw that the device is can effectual solution traditional appeared when fixing the wire, twists not tight problem, does not also have anxiously to have the rusty condition of screw, had both made things convenient for the inlet wire and be qualified for the next round of competitions, has still saved a large amount of assemble durations and takedown time, and the connection closely is difficult to the condition that appears disappearing and lose between each part.